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"ARTICLE";"GauthierThomas1990";"The close correlation between sodium intake and blood sodium turnover and the narrow 95% confidence limits on the relationship (± 11% for Na consumption over 6.0 mmol) show that the 22Na technique may give precise estimates of food intake for individuals. The 3H technique does not provide precise measures of fat reserves in individuals because estimates of body fat have an error term ranging from 25-150%, but it is sufficiently precise to allow the comparison of fat reserves between groups of birds. Adult cliff swallows Hirundo pyrrhonota have 60.3% lower fat reserves during a 2nd breeding attempt compared with the first. -from Authors";;;;"Gauthier, M. and Thomas, D.W.";;;;;;;;;;;;;;"Canadian Journal of Zoology";;"cliff swallow fat reserve passerine sodium-22 swallow tritiated water Hirundo pyrrhonota";;;;"00084301 (ISSN) Cited By (since 1996): 4 Export Date: 26 April 2007 Source: Scopus Language of Original Document: English";"7";;"brugerolles";"1590-1594";;;;;;;"2007.12.05";"Evaluation of the accuracy of 22Na and tritiated water for the estimation of food consumption and fat reserves in passerine birds";;;"68";"1990";;